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What columns generally make good indexes?
As a follow up to " What are indexes and how can I use them to optimise queries in my database? " where I am attempting to learn about indexes, what columns are good index candidates? Specifically for an MS SQL database?
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Is there a performance impact when calling ToList()?
...i++ has a performance impact, it slows the program for maybe a few ticks.
What does .ToList do?
When you invoke .ToList, the code calls Enumerable.ToList() which is an extension method that return new List<TSource>(source). In the corresponding constructor, under the worst circumstance, it g...
What's the most elegant way to cap a number to a segment? [closed]
...posed (maybe more understandable than minimaxing) but it really depends on what you mean by "readable"
function clamp(num, min, max) {
return num <= min ? min : num >= max ? max : num;
}
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What is the “->” PHP operator called and how do you say it when reading code out loud? [closed]
What do you call this arrow looking -> operator found in PHP?
16 Answers
16
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What is Java EE? [duplicate]
I realize that literally it translates to Java Enterprise Edition. But what I'm asking is what does this really mean? When a company requires Java EE experience, what are they really asking for? Experience with EJBs? Experience with Java web apps?
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One line if-condition-assignment
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I don't think this is possible in Python, since what you're actually trying to do probably gets expanded to something like this:
num1 = 20 if someBoolValue else num1
If you exclude else num1, you'll receive a syntax error since I'm quite sure that the assignment must ac...
What's the difference between a POST and a PUT HTTP REQUEST?
They both seem to be sending data to the server inside the body, so what makes them different?
17 Answers
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What's valid and what's not in a URI query?
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To answer what's valid in a query string I checked which special characters get replaced by chrome when making a request:
Space -> %20
! -> !
" -> %22
# -> removed, marks the end of the query string
% -> %
& -> &...
Why does C++ need a separate header file?
...t javac can and does. The header file is needed to declare to the compiler what it can expect to be available at link time.
So #include is a straight textual substitution. If you define everything in header files, the preprocessor ends up creating an enormous copy and paste of every source file in...
Defining static const integer members in class definition
...n though test::N is also referenced on the previous line).
Any idea as to what's going on?
std::min takes its parameters by const reference. If it took them by value you'd not have this problem but since you need a reference you also need a definition.
Here's chapter/verse:
9.4.2/4 - If a stati...